Inventors at work, with chapters on discovery (1906)
Iles, George, 1852-1942 · New York, Doubleday, Page & company · leaf 457
articulate speech can be reproduced bythe oxyhydrogen light, and even by a beam from a kerosene lamp.The loudest effects follow upon interrupting the light by meansof a perforated disk swiftly rotated. Because this apparatus isnoiseless it allows a close approach of the receiver while… … Selenium cylinder withreflector. LIGHT BY ITSELF IS VOCAL 399 Cross has rendered us aid. When a solution of alum, or bisul-phide of carbon, is employed, there is but slight reduction inloudness, but a solution of iodine in bisulphide of carbon cutsoff most of the audible effect. Even an opaque…
Inventions · Inventors
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